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From "Edward Bortnikov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16417) In-Memory MemStore Policy for Flattening and Compactions
Date Sat, 11 Mar 2017 07:30:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15906123#comment-15906123
] 

Edward Bortnikov commented on HBASE-16417:
------------------------------------------

.. So [~eshcar] answered nearly all of it here .. A couple of small remarks. 

The expected number of 2 segments in the pipeline follows from the fact that disk flush normally
happens when there are 4. Assuming we are growing from 0, the expectation is 2. 

The varying WAL size with Async WAL introduces much noise indeed. However, please note that
the overall volume of WAL writes differs between Sync and Async without one line of Accordion
involved, why does this happen with the same workload? (Note that with Sync, the WAL volume
is the same no matter what type of in-memory compaction is used). Looking forward to some
help here :)

> In-Memory MemStore Policy for Flattening and Compactions
> --------------------------------------------------------
>
>                 Key: HBASE-16417
>                 URL: https://issues.apache.org/jira/browse/HBASE-16417
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>            Assignee: Eshcar Hillel
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16417-benchmarkresults-20161101.pdf, HBASE-16417-benchmarkresults-20161110.pdf,
HBASE-16417-benchmarkresults-20161123.pdf, HBASE-16417-benchmarkresults-20161205.pdf, HBASE-16417-benchmarkresults-20170309.pdf
>
>




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